Newman projections of the chair conformations of methylcyclohexane Assignment Help

Cycloalkanes - Newman projections of the chair conformations of methylcyclohexane

Newman projections of the chair conformations of methylcyclohexane:

This can be demonstrated by comparing Newman diagrams of the two methylcyclohexane conformations shown in the below figure.

936_Newman projections of the chair conformations of methylcyclohexane.png

Figure:   Newman projections of the chair conformations of methylcyclohexane.

A torsion angle of 60? among the C-C bonds represents a gauche interaction and thus an axial methyl substituent experiences 2 gauche interactions along with the cyclohexane ring while the equatorial methyl substituent experiences none. The result of it is, the latter chair conformation is chosen and about 95% of methylcyclohexane molecules are in this conformation at any one time, as compared to 5% in another conformation.


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